Metallica is an American heavy metal band formed in Los Angeles, California. The band was formed in 1981 when vocalist/guitarist James Hetfield responded to an advertisement posted by drummer Lars Ulrich in a local newspaper. Metallica's current line-up comprises founding members Hetfield and Ulrich, longtime lead guitarist Kirk Hammett and bassist Robert Trujillo. Guitarist Dave Mustaine and bassists Ron McGovney, Cliff Burton and Jason Newsted are former members of the band.

The band's fast tempos, instrumentals, and aggressive musicianship placed them as one of the founding "big four" bands of thrash metal, alongside Anthrax, Megadeth, and Slayer. Metallica earned a growing fan base in the underground music community and won critical acclaim with its first four albums; their third album Master of Puppets (1986) was described as one of the most influential and heaviest of thrash metal albums. The band expanded its musical direction and achieved substantial commercial success with its eponymous fifth album Metallica (1991), which resulted in an album that appealed to a more mainstream audience. The album was also their first to debut at number one on the Billboard 200, a success that they also achieved on their following five studio albums. In 2000, Metallica joined with other artists who filed a lawsuit against Napster for sharing the band's copyright-protected material without consent from the band. A settlement was reached and Napster became a pay-to-use service. The release of St. Anger (2003) alienated fans with the exclusion of guitar solos and the "steel-sounding" snare drum, and a film titled Some Kind of Monster documented the recording of St. Anger and the tensions within the band during that time. The band returned to its original musical style with the release of Death Magnetic (2008), and in 2009, Metallica was inducted into the Rock and Roll Hall of Fame. After touring for most of the next eight years, the band followed up with Hardwired... to Self-Destruct (2016), which demonstrated examples from some of the different musical styles that the band has dabbled in throughout its career.

Metallica has released ten studio albums, four live albums, five extended plays, 26 music videos, and 37 singles. The band has won eight Grammy Awards and six of its albums have consecutively debuted at number one on the Billboard 200. The band's eponymous 1991 album has sold over 16 million copies in the United States, making it the best-selling album of the SoundScan era. Metallica ranks as one of the most commercially successful bands of all time, having sold over 110 million records worldwide.[1] Metallica has been listed as one of the greatest artists of all time by many magazines, including Rolling Stone, which ranked them 61st on its list of The 100 Greatest Artists of All Time.[2] As of December 2012, Metallica is the third-best-selling music artist since Nielsen SoundScan began tracking sales in 1991, selling a total of 54.26 million albums in the U.S.[3][4] Metallica collaborated over a long period with producer Bob Rock, who produced four of the band's studio albums between 1990 and 2003 and served as a temporary bassist during the production of St. Anger. In 2012, Metallica formed the independent record label Blackened Recordings and took full ownership of its albums and videos. The band is currently promoting Hardwired... to Self-Destruct, which was released on November 18, 2016.

"Nothing Else Matters" is a song by American heavy metal band Metallica. It was released in 1992 as the third single from their self-titled fifth studio album, Metallica. The song peaked at number 11 on the Billboard Mainstream Rock Tracks chart as well as top-ten positions on many European charts. "Nothing Else Matters" was featured as a playable track in the music video game Guitar Hero: Metallica. Recognized as one of Metallica's best known and most popular songs, it has become a staple in live performances. The song has been covered over forty times.